IBC VFC 15-150 Operating Instructions Manual page 2

DANGER
A combustion test must be done
by a qualified, trained and licensed
gas fitter in order to complete any
fuel conversion.
Making adjustments to the IBC gas
valve without a properly calibrated
gas combustion analyzer and by
persons who are not trained and
experienced in its use is forbidden.
Failure to use an analyzer can
result in an immediate hazard.
Removal of flue gas test port plug
Insertion of flue gas analyzer probe
MODEl HiGH fiRE
NuMbER iNPuT
NATuRAl GAs OR PROPANE
VFC 15-150 150 MBh
VFC 45-225 225 MBh
Table 3: Rated input of a converted
boiler / water heater
2
VFC 15-150 / VFC 45-225
NATURAL GAS coNveRSioN PARTS KiT# P-176
Refer to the details in the boiler's current Installation and Operation Manual,
section 3.3 - "COMMISSIONING", 3.4 "FUEL CONVERSION"
The low Fire (Zero-offset) valve and high Fire (Gas: air) ratio adjustment will have
to be adjusted to attain optimum combustion results whenever fuel conversion
is undertaken however, no mixture adjustment shall be performed unless
done by a qualified technician using properlyfunctioning and calibrated
combustion analyzing equipment.
NOTE:
Fuel conversion for the VFC-series boilers involves only gas valve re-
calibration and boiler re-labelling. There are no other hardware changes (e.g.
no gas orifice insertion or removal).
MODEl HiGH fiRE
RANGE
VFC 15-150 8.9 to
(natural Gas) 9.5% Co
VFC 15-150 10.4 to
(Propane) 10.7% Co
VFC 45-225 8.9 to
(natural Gas) 9.5% Co
VFC 45-225 10.4 to
(Propane) 10.7% Co
Table 2: Combustion test target ranges - CO
fuel conversion instructions
The following procedure must be carried out by a qualified technician.
1. ensure you are installing the correct fuel conversion kit for your boiler.
Compare the boiler model number with the Kit# found in Table #1.
2. ensure the fuel conversion instructions supplied with the fuel conversion kit are
read, understood and followed carefully.
3. Carefully follow the procedures on page 3, Combustion Testing and
Adjustment.
4. Place the conversion labels associated with the new fuel onto the boiler at the
positions indicated on page 4 of this instruction sheet.
combustion Testing and Adjustment
To verify the proper operation of the gas valve in the field, the following procedure
can be carried out by a qualified technician (diagrams on this page).
Normal ignition system sequence of operation: The boiler control, upon a call
for heat or dhw, will turn on the combustion fan for a 20 second pre-purge, then
energize the spark electrode and gas valve for a 4 second trial for ignition. If the
burner does not light and prove flame, the process is repeated until the burner
lights and flame is detected or after 3 trials for ignition the boiler will lock out and
will need to be manually reset by clearing the error. The boiler will automatically
reset after 60 minutes if no action is taken.
lOw fiRE
TARGET RANGE
7.9 to
9.2% Co
2
8.6% Co
2
9.0 to
10.6% Co
2 9.8% Co
2
7.9 to
9.2% Co
2 8.6% Co
2
9.0 to
10.6% Co
2 9.8% Co
2
/ Maximum CO
2
cO MAx
PPM
TARGET
8.4% Co < 100
2
2
9.6% Co < 150
2
2
8.4% Co < 120
2
2
9.6% Co < 180
2
2
120-170 R2